Posted by Harry on October 05, 2000 at 08:25:11:
In Reply to: transformer oils ARE DIFFERENT, posted by Gordon (the Scottish one) on October 04, 2000 at 02:37:52:
Hardened seats were used in the oldsters because they needed to be replacable as they needed the valves reground perodically . When valves were placed in the heads they were easily taken to the head shop if you ever needed new seats .